Corner plot showing the dependence of GWB variance (colour scale) on the model parameters, considering the lowest (left) and highest (right) frequency bin. As can be inferred from the colour scale (more evident in the left panel), lower values of α and β combined with a high cutoff mass M₀ are linked to a larger scatter, which is caused by the increased probability of having more massive binaries that can produce spikes in the signal. Finally, the figure also shows that the sampling of the parameter space is sufficient to cover it uniformly.